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首页> 外文学位 >Reference symbol assisted multistage successive interference cancelling receiver for code division multiple access wireless communication systems.
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Reference symbol assisted multistage successive interference cancelling receiver for code division multiple access wireless communication systems.

机译：用于码分多址无线通信系统的参考符号辅助的多级连续干扰消除接收机。

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摘要

This thesis investigates the performance of the reference symbol assisted successive interference cancelling (RAMSIC) receiver for CDMA wireless communication systems. The reverse link of a CDMA system with binary antipodal modulation and coherent detection is considered. The results with biphase spreading of the modulated signal show that the initial capacity improvement is relatively small. This is because interference from symbols not yet detected by the receiver signifcantly corrupts the channel estimates. Therefore, the transmitted signal structure has been modified to include guard intervals around the reference symbols to minimize this interference. Single cell analysis shows that the proposed technique results in a system with capacity approaching 80% that of the system with successive interference cancellation operating with perfect channel estimates. Multi-cell performance results demonstrate that without any forward error correction, the capacity of the proposed system with the RAMSIC receiver compares very favourably with that of comparable CDMA systems employing conventional detection and coding even when the path loss exponent is two. Further analysis shows that the RAMSIC receiver with quadriphase spreading performs significantly better than that with biphase spreading which in turn is superior to the conventional matched filter receiver. Performance analysis with imperfect parameter estimation shows that chip synchronization errors of the order to be expected in a properly designed conventional CDMA system have only minimal effect on performance but power control error, on the other hand, significantly affects performance. Hence, additional diversity should be employed to minimize the power control error. Consequently, the application of antenna diversity is then investigated. The results show that with a realistic feedback power control algorithm and in fast fading the capacity of the system with dual receive antenna diversity can be increased 1.6 times over that of the IS-95 system. It is also demonstrated that the capacity of the system in slow fading environment increases dramatically over that under fast fading. Therefore, the 1.6 fold advantage of the RAMSIC receiver may be interpreted as the worst case performance advantage. Investigation of transmitter antenna diversity shows that in systems requiring lower BER (10{dollar}sp{lcub}-4{rcub}{dollar} or less), such as in image and video communication, artificial multipath created by two transmitting antennas should also be considered as one possible way to increase capacity.
机译：本文研究了用于CDMA无线通信系统的参考符号辅助连续干扰消除（RAMSIC）接收机的性能。考虑了具有二进制对映调制和相干检测的CDMA系统的反向链路。调制信号的双相扩展结果表明，初始容量改善相对较小。这是因为来自接收机尚未检测到的符号的干扰显着地破坏了信道估计。因此，发送信号的结构已被修改为在参考符号周围包括保护间隔，以最大程度地减少这种干扰。单小区分析表明，所提出的技术导致系统容量接近具有连续干扰消除功能且具有完美信道估计的系统容量的80％。多小区性能结果表明，在没有任何前向纠错的情况下，所提出的具有RAMSIC接收机的系统的容量与采用常规检测和编码的类似CDMA系统的容量相比非常有利，即使路径损耗指数为2。进一步的分析表明，具有四相扩展的RAMSIC接收机的性能明显优于具有双相扩展的RAMSIC接收机，后者又优于传统的匹配滤波器接收机。具有不完美的参数估计的性能分析表明，在适当设计的常规CDMA系统中，预期数量级的芯片同步误差对性能的影响很小，而另一方面，功率控制误差则对性能有很大影响。因此，应采用额外的分集来最小化功率控制误差。因此，然后研究了天线分集的应用。结果表明，采用现实的反馈功率控制算法并在快速衰落中，具有双接收天线分集的系统容量可以比IS-95系统增加1.6倍。还表明，慢速衰落环境中的系统容量比快速衰落环境下的系统容量显着增加。因此，RAMSIC接收器的1.6倍优势可以解释为最坏情况下的性能优势。对发射机天线分集的研究表明，在要求较低BER（10 {dollar} sp {lcub} -4 {rcub} {dollar}或更小的BER的系统中，例如在图像和视频通信中），也应由两个发射天线创建的人工多径被认为是增加容量的一种可能方法。

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  • 作者

    Soong, Anthony Chak Keung.;

  • 作者单位

    University of Alberta (Canada).;

  • 授予单位 University of Alberta (Canada).;
  • 学科 Engineering Electronics and Electrical.
  • 学位 Ph.D.
  • 年度 1997
  • 页码 258 p.
  • 总页数 258
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 无线电电子学、电信技术;
  • 关键词

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